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Effect of Bacillus cohnii on Some Physicomechanical and Microstructural Properties of Ordinary Portland Cement
Joint Authors
Wachira, Jackson Muthengia
Wangui, Ngari Reginah
Karanja Thiong’o, Joseph
Source
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-8, 8 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-09-27
Country of Publication
Egypt
No. of Pages
8
Main Subjects
Abstract EN
Cement-made materials face durability and sustainability challenges.
This is majorly caused by the presence of cracks.
Cracking affects the mechanical strength of cement-based materials.
Microbiologically induced calcite precipitation (MICP) has been found to enhance compressive strength, thus enhancing on the mechanical and durability properties of these materials.
This paper presents the findings of a study conducted to investigate the effect of Bacillus cohnii on compressive strength development of OPC mortar prisms and the effect of Bacillus cohnii on cement setting time and soundness.
Microbial concentration of 1.0 × 107 cells·ml−1 was used.
Compressive strength tests analyses were carried out for each category of mortar prisms.
Compressive strength tests were carried out on the 2nd, 7th, 14th, 28th, 56th, and 90th day of curing in distilled water and microbial solutions.
All microbial mortars exhibited a greater compressive strength compared to the control with the highest observed at 90 days.
Highest percentage gain in compressive strength was observed at 90 days which is 28.3%.
Microstructural analysis was carried out using a scanning electron microscope (SEM) after 28 days of curing.
The results indicated the presence of calcium carbonate and more calcium silicate hydrate (CSH) deposits on the bacterial mortars.
The bacteria did not have an effect on cement soundness.
Setting time was significantly accelerated.
American Psychological Association (APA)
Wangui, Ngari Reginah& Karanja Thiong’o, Joseph& Wachira, Jackson Muthengia. 2020. Effect of Bacillus cohnii on Some Physicomechanical and Microstructural Properties of Ordinary Portland Cement. Journal of Chemistry،Vol. 2020, no. 2020, pp.1-8.
https://search.emarefa.net/detail/BIM-1182219
Modern Language Association (MLA)
Wangui, Ngari Reginah…[et al.]. Effect of Bacillus cohnii on Some Physicomechanical and Microstructural Properties of Ordinary Portland Cement. Journal of Chemistry No. 2020 (2020), pp.1-8.
https://search.emarefa.net/detail/BIM-1182219
American Medical Association (AMA)
Wangui, Ngari Reginah& Karanja Thiong’o, Joseph& Wachira, Jackson Muthengia. Effect of Bacillus cohnii on Some Physicomechanical and Microstructural Properties of Ordinary Portland Cement. Journal of Chemistry. 2020. Vol. 2020, no. 2020, pp.1-8.
https://search.emarefa.net/detail/BIM-1182219
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1182219